The current study investigates the effect of adding an individual growth measure to the primary definition of AYP. A variety of approaches to measuring growth have already been identified and are in use in schools across the country. In almost every statewide assessment system, a measure of the amount that individual students change from one year to the next is a feasible addition. The primary point of this study is to investigate whether, and to what extent, current AYP definitions could be improved by adding an individual growth measure to reflect the percentage of students who are currently identified as proficient. (Contains 6 tables and 14 figures.)